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1. The governor of a country or province who rules in the name of the sovereign with regal authority, as the king's substitute; as, the viceroy of india.

2. (Science: zoology) A large and handsome American butterfly (Basilarchia, or Limenitis, archippus). Its wings are orange-red, with black lines along the nervures and a row of white spots along the outer margins. The larvae feed on willow, poplar, and apple trees.

Origin: F. Vice-roi; pref. Vice- in the place of (L. Vice) _ roi a king, L. Rex. See Vice, and Royal.